TY - JOUR AU - Šlapal, Josef TI - Relations and topologies JO - Czechoslovak Mathematical Journal PY - 1993 SP - 141 EP - 150 VL - 43 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1993.128381/ DO - 10.21136/CMJ.1993.128381 LA - en ID - 10_21136_CMJ_1993_128381 ER -